Typewriting machine



$epfi. 15, 1924;

. 1,508,808 J. WALDHEIM TYPEWRITING MACHINE Filed Jan. 19, 1922 Fig/I I /nvenfor:

JOHN WALDHEIM, OF ELIZA-BETH, NEW JERSEY, ASSlGNOR TO UNDERWOOD' TYPE- WRI'IER COMPANY, OF NEW YORK, N. Y., A COREORATION OF DELAWARE.

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Application filed January 19, 1922. Serial No. 580,288.

To all whom it may concern."

Be it known that 1, JOHN WALDHEIM, a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

This invention relates to typewriting machines, and more particularly to means for feeding a work-sheet, which may be a stiff card, such as a stencil-card, to the platen.

An object of the invention is to provide,

for this purpose, a device which is simple in construction and which may readily be manipulated.

A feature of the invention is the provision of means on the platen by which a positive feed may be established between the platen and the stencil-card without fastening the card rigidly on the platen and without bending the card to conform to the curvature of the platen. To this end, the platen is provided with teeth which may enter perforations in the card, said teeth serving also to align the card and position it lengthwise of the platen.

Pressure fingers are provided to press the card toward the platen to hold it in engagement with the teeth, said fingers 'being effective to guide the stencil-card about the platen and behind the usual type-bar segment.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a view of a stencil-card showing the perforations near its side edges.

igure 2 is a front view of a typewriter carriage, showing the invention applied thereto.

Figure 3 is a sectional side view, looking from the left-hand end of the carriage, showing the stencil-card inserted about the platen. I

Figure 4 is a view similar to Figure 3, showin the stencil-card being inserted about t e platen.

' Figure 5 is a detail side view, considerably enlarged, showing the card being positioned endwise of the platen and also being aligned or squared relatively thereto by the teeth, prior to feedin' the card about the platen.

A carriage 0 an Underwood typewriting machine, to which the invention is herein vbringing the holes 27 into re'glster with the shown applied, comprises a platen-frame 10 havin two end plates 11 secured to each other ya cross-bar 12 and a rod 13. A platen 14 is revolubly supported by means of a platen-shaft 15, which may be rotated- Within bearings 16 in the end plates 11 of the platen-frame. The platen may be rotated by fin er-wheels 17, one at each end of the platen-shaft, or by means of a line-space Wheel 20, the latter having engaging therewith the usual detent 21, and being actuable by means including the usual line-space handle 22. r v

A stencil-card 23 may be inserted about the platen from the front thereof. To assist in inserting the card, there are provided two guide fingers 24 flaring outwardly at their upper edges 25 to form with the platen receptacles into which the lower edge of the stencil-card may be set, where it is aligned and positioned lengthwise of the platen, as hereinafter described.

To feed the stencil about the platen, two rows of driving elements or teeth 26 are provided on the platen, one at each end thereof, said teeth engaging in perforations or holes 27 in the stencil-card, said holes forming abutments 28 at the upper and lower sides thereof against which the teeth 26' of the platen bear while feeding the stencil.

It will be seen that the lower edge of the stencil-card 23 is provided with semi-circular cut-outs 30 which are in line with the holes 27. With this arrangement, the card may readily be positioned lengthwise of the platen by placing the cut-outs 30 over two teeth 26 at the bottomof the flaring portions 25 of the guide fingers (Figure 5), thus teeth 26 and also alignin the card. To enable two teeth to be at t e bottom of the flaring portions at various rotary positions of the platen, the number of said teeth may be a factor of the number of teeth on the line-space wheel, and the platen may be held in such ositionsby the detent 21, which engages t e line-space wheel 20.

The fingers 24 may be fairly stiff to hold the card in engagement with the teeth and guide said card while being moved up and down relatively to the printing point during line-spacing operations of the platen. Said fingers are herein shown as supported on brackets or arms 31 extending downwardly from a cross-bar 32 secured to the end plates of the platen-frame by screws 33. The lower ends of the fingers 24 form, with-the lower ends 34 of the arms 31, guides 35 for the lower end of the stencil-card (Figure 3). The fingers" are also curved rearwardly to guide the card behind the cross-bar 36 of .the type-bar segment 37.

The platen may be covered with a thin layer 40 of celluloid to present a suitable resisting surface to the printing types. Since three lines are usually typed on a stencil section 41 of the card only a portion of the periphery of the platen is used and may be used repeatedly, but a new portion or surface may be brought into use by simply rotating the platen after a used portion becomes worn by the types.

It will be understood that a sli ht downward pressure may be exerted on t e card by one hand while the laten isreversely rotated through the me mm of the finger-wheel 17 by the other hand until one tooth of each row. has entered a hole at each end of the card, after which the card may be relieved of the pressure from the one hand and be readily fed to its lowest position.-

It will also be understood that the ribbon mechanism including the ribbon-silencing device, not shown, may be used and may be like that disclosed in the patent to (look No. 926,050, dated June 22, 1909, so as to enable the typing of the'name, with the ribbon, on the top edge of the card for filing purposes, and typing the stencil section 41 without the use of the ribbon.

A bracket 45 on the rod 13 supporting the roller d6 which rides on the rail 47 of the usual shift-frame 48 is so shaped as to support said roller from the rear thereof so as to provide clearance for the card in its lowest position (Figure 3).

It will sometimes be discovered after the removal of a stencil from the machine that a character has been struck too lightly. It is desirable to re-insert such a stencil for correction. The feeding teeth on the platen assure an unvarying positionof the stencil with reference to the line of writing and lengthwise of the platenfsm that a stencil re-inserted for correction will .;be mechani- Y cally located in the same position as before, and therefore in. the exact position required with reference to the previouslytyped matter. 1

Variations may be resorted to within the scope of the invention, and portionsol the improvements may be used without others.

Having thus described my invention, ll claim: 4

1. In afront-strike typewritin machine, the combination with ty ing instrumentalities, of an introducer or a stencil card that 'is inserted downwardly, bottom end foremost, at the printing point, said nsoaeoe the pr1nting line at their upper ends, and

permitting the insertion of the lower end of the card between them and the platen, said lips extending down in front of the platen and terminating below the laten at the front thereof and guiding .t he card downwardly below the bottom of the platen in approximately straight condition, and also comprising rows of teeth at opposite ends of the platen and protrudin into perforations in the sides of the card, said lip extensions overlying saidteeth and holding the card in co-operation with the teeth and platen at the rinting line.

. 2. ln a front-stri e typewriting machine, the combination with typing instrumentalities, of an introducer for a stencil card that is inserted downwardly, bottom end fore most, at the printin point, said introducer comprising a revolu le platen forming one member of the introducer, and also comprising resilient guiding 1i s diverging from the front of the platen a ove the printing line at their upper ends, and permittin the insertion of the lower end of the car between them and the la ch, said lips extending down in front 0 the platen and terrornating below the platen at the front thereof and guiding the card downwardly below the bottom of the platen in approximately.

straight condition, and also comprising rows of teeth at opposite ends of the platen and protruding into perforations in the sides of the card, said lip extensions overlying said teeth and holding the card in co-operation with the teeth and platen at the rinting line, a frame for the platen, and a bar mounted on said frame and extending along the platen, said lips supported upon said her.

3. lln a front-strike typewriting machine, the combination with typing instrumentalities, of an introducer for a stencil card that is inserted downwardly, bottom end toremost, at'the printin point, said int roducer comprising a revolu le platen forming one member of the introducer, and also comrising resilient guiding lips diverging lld om the front of the platen alcove the printing line at their upper ends, and ermittin.

the insertion of the lower end 0 the car between them and'the platen, said lips extending down in front of the platen and terminatin' below the platen at the front in the sides'ofthe card, said lip extensions overlying said teeth and holding the card in cooperation with the teeth and platen at the printin line said teeth on the platen being of b unt form so as not to extend through the card, and the extensions pressing flat on the card over the perforated side borders thereof.

4. In a front-strike typewriting machine, the combination with typing instrumentalities, of an introducer for a stencil card that is inserted downwardly, bottom end. fore; most, at the printin point, said introducer comprising a revoluile platen forming one member of the introducer, and also comprisin resilient guiding lips diverging from t e front of the platen above the printing line at their upper ends, and permittin the insertion of the lower end of the car between them and the platen, said lips extending down in front of the platen and terminatin below the platen at the front thereof and guidin below the bottom 0 the platen in approximately straight condition, and also comprising rows of teeth at opposite ends of the platen and rotruding into perforations in the sides 0 the card, said lip extensions overlying said teeth and holdin the card in co-operation with the teeth ant l platen at the printing line, a carriage for said platen, and a type-bar segment, said guiding lips traveling'with the carriage and directing the card downwardly from the front of the platen and behind the type-bar segment.

I 5. In a front-strike typewriting machine, the combination with typing instrumentalities, of an introducer for a stencil card that is inserted downwardly, bottom end foremost, at the printing point, said introducer comprising a revoluble platen forming one member of the introducer,'and also comprising resilient guiding lips diverging from the front of the platen above the printing line at their upper ends, and ermitting the insertion of the lower en of the card between them and the laten, said lips extending down in front of the platen and terminating below the platen at the front thereof and guiding the card downthe card downwardly line-space wheel, said teeth having an ali-' uot relation to the line-space wheel, so

t at the card-gaging position of the platen teeth with relation to the line of writing will always be the same.

6. In a front-strike typewriting machine, the combination with typing instrumentalities, of an introducer for a stencil card that is inserted downwardly, bottom end foremost, at the printin point, said introducer comprising a revolu le platen forming one member of the introducer, and also comprising resilient guiding lips diverging from the front of the platen above the printing line at their upper ends, and ermittin the insertion of the lower end of the car between them and the platen, said lips extending down in front of the platen and terminating below the platen at the front thereof and guidin below the bottom 0 the platen in approximately straight condition, and also comprising rows of teeth at opposite ends of the platen and rotrudin into perforations in the sides of the car said li extensions overlying said teeth and holding the card in co-operation with the teeth and platen at the printing line, and a hard smooth backing for the stencil cards upon the periphery of the platen and co-operating with 'the types-in cuttin the stencils, said backing being too smoot to grip a stencil card properly for controlling the feed thereof.

JOHN W ALDHEIM Witnesses:

CATHERINE A. N EWELL, Enrrn B. LIBBEY.

the card downwardly 

